/* jfs.h - an extractions from linux/include/linux/jfs/jfs* into one file *//*    *  GRUB  --  GRand Unified Bootloader *  Copyright (C) 2000  International Business Machines  Corp. *  Copyright (C) 2001  Free Software Foundation, Inc. * *  This program is free software;  you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or  *  (at your option) any later version. *  *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY;  without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See *  the GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program;  if not, write to the Free Software  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,  *  MA 02110-1301, USA. */#ifndef _JFS_H_#define _JFS_H_/* those are from jfs_filsys.h *//* *	 file system option (superblock flag) *//* platform option (conditional compilation) */#define JFS_AIX		0x80000000	/* AIX support *//*	POSIX name/directory  support */#define JFS_OS2		0x40000000	/* OS/2 support *//*	case-insensitive name/directory support */#define JFS_LINUX      	0x10000000	/* Linux support *//*	case-sensitive name/directory support *//* directory option */#define JFS_UNICODE	0x00000001	/* unicode name *//* bba */#define	JFS_SWAP_BYTES		0x00100000	/* running on big endian computer *//* *	buffer cache configuration *//* page size */#ifdef PSIZE#undef PSIZE#endif#define	PSIZE		4096	/* page size (in byte) *//* *	fs fundamental size * * PSIZE >= file system block size >= PBSIZE >= DISIZE */#define	PBSIZE		512	/* physical block size (in byte) */#define DISIZE		512	/* on-disk inode size (in byte) */#define L2DISIZE	9#define	INOSPERIAG	4096	/* number of disk inodes per iag */#define	L2INOSPERIAG	12#define INOSPEREXT	32	/* number of disk inode per extent */#define L2INOSPEREXT	5/* Minimum number of bytes supported for a JFS partition */#define MINJFS			(0x1000000)/* * fixed byte offset address */#define SUPER1_OFF	0x8000	/* primary superblock */#define AITBL_OFF	(SUPER1_OFF + PSIZE + (PSIZE << 1))/* *	fixed reserved inode number *//* aggregate inode */#define	AGGREGATE_I	1	/* aggregate inode map inode */#define	FILESYSTEM_I	16	/* 1st/only fileset inode in ait:				 * fileset inode map inode				 *//* per fileset inode */#define	ROOT_I		2	/* fileset root inode *//* *	directory configuration */#define JFS_NAME_MAX	255#define JFS_PATH_MAX	PSIZE#if 0typedef unsigned char u8;typedef char s8;typedef unsigned short u16;typedef short s16;typedef unsigned int u32;typedef int s32;typedef unsigned long long u64;typedef long long s64;#endiftypedef u16 UniChar;/* these from jfs_btree.h *//* btpaget_t flag */#define BT_TYPE		0x07	/* B+-tree index */#define	BT_ROOT		0x01	/* root page */#define	BT_LEAF		0x02	/* leaf page */#define	BT_INTERNAL	0x04	/* internal page */#define	BT_RIGHTMOST	0x10	/* rightmost page */#define	BT_LEFTMOST	0x20	/* leftmost page *//* those are from jfs_types.h */struct timestruc_t {	u32 tv_sec;	u32 tv_nsec;};/* *	physical xd (pxd) */typedef struct {	unsigned len:24;	unsigned addr1:8;	u32 addr2;} pxd_t;/* xd_t field extraction */#define	lengthPXD(pxd)	((pxd)->len)#define	addressPXD(pxd)	(((s64)((pxd)->addr1)) << 32 | ((pxd)->addr2))/* *	data extent descriptor (dxd) */typedef struct {	unsigned flag:8;	/* 1: flags */	unsigned rsrvd:24;	/* 3: */	u32 size;		/* 4: size in byte */	unsigned len:24;	/* 3: length in unit of fsblksize */	unsigned addr1:8;	/* 1: address in unit of fsblksize */	u32 addr2;		/* 4: address in unit of fsblksize */} dxd_t;			/* - 16 - *//* *	DASD limit information - stored in directory inode */typedef struct dasd {	u8 thresh;		/* Alert Threshold (in percent) */	u8 delta;		/* Alert Threshold delta (in percent)   */	u8 rsrvd1;	u8 limit_hi;		/* DASD limit (in logical blocks)       */	u32 limit_lo;		/* DASD limit (in logical blocks)       */	u8 rsrvd2[3];	u8 used_hi;		/* DASD usage (in logical blocks)       */	u32 used_lo;		/* DASD usage (in logical blocks)       */} dasd_t;/* from jfs_superblock.h */#define JFS_MAGIC 	0x3153464A	/* "JFS1" */struct jfs_superblock{	u32 s_magic;		/* 4: magic number */	u32 s_version;		/* 4: version number */	s64 s_size;		/* 8: aggregate size in hardware/LVM blocks;				 * VFS: number of blocks				 */	s32 s_bsize;		/* 4: aggregate block size in bytes; 				 * VFS: fragment size				 */	s16 s_l2bsize;		/* 2: log2 of s_bsize */	s16 s_l2bfactor;	/* 2: log2(s_bsize/hardware block size) */	s32 s_pbsize;		/* 4: hardware/LVM block size in bytes */	s16 s_l2pbsize;		/* 2: log2 of s_pbsize */	s16 pad;		/* 2: padding necessary for alignment */	u32 s_agsize;		/* 4: allocation group size in aggr. blocks */	u32 s_flag;		/* 4: aggregate attributes:				 *    see jfs_filsys.h				 */	u32 s_state;		/* 4: mount/unmount/recovery state: 				 *    see jfs_filsys.h				 */	s32 s_compress;		/* 4: > 0 if data compression */	pxd_t s_ait2;		/* 8: first extent of secondary				 *    aggregate inode table				 */	pxd_t s_aim2;		/* 8: first extent of secondary				 *    aggregate inode map				 */	u32 s_logdev;		/* 4: device address of log */	s32 s_logserial;	/* 4: log serial number at aggregate mount */	pxd_t s_logpxd;		/* 8: inline log extent */	pxd_t s_fsckpxd;	/* 8: inline fsck work space extent */	struct timestruc_t s_time;	/* 8: time last updated */	s32 s_fsckloglen;	/* 4: Number of filesystem blocks reserved for				 *    the fsck service log.  				 *    N.B. These blocks are divided among the				 *         versions kept.  This is not a per				 *         version size.				 *    N.B. These blocks are included in the 				 *         length field of s_fsckpxd.				 */	s8 s_fscklog;		/* 1: which fsck service log is most recent				 *    0 => no service log data yet				 *    1 => the first one				 *    2 => the 2nd one				 */	char s_fpack[11];	/* 11: file system volume name 				 *     N.B. This must be 11 bytes to				 *          conform with the OS/2 BootSector				 *          requirements				 */	/* extendfs() parameter under s_state & FM_EXTENDFS */	s64 s_xsize;		/* 8: extendfs s_size */	pxd_t s_xfsckpxd;	/* 8: extendfs fsckpxd */	pxd_t s_xlogpxd;	/* 8: extendfs logpxd */	/* - 128 byte boundary - */	/*	 *      DFS VFS support (preliminary) 	 */	char s_attach;		/* 1: VFS: flag: set when aggregate is attached				 */	u8 rsrvd4[7];		/* 7: reserved - set to 0 */	u64 totalUsable;	/* 8: VFS: total of 1K blocks which are				 * available to "normal" (non-root) users.				 */	u64 minFree;		/* 8: VFS: # of 1K blocks held in reserve for 				 * exclusive use of root.  This value can be 0,				 * and if it is then totalUsable will be equal 				 * to # of blocks in aggregate.  I believe this				 * means that minFree + totalUsable = # blocks.				 * In that case, we don't need to store both 				 * totalUsable and minFree since we can compute				 * one from the other.  I would guess minFree 				 * would be the one we should store, and 				 * totalUsable would be the one we should 				 * compute.  (Just a guess...)				 */	u64 realFree;		/* 8: VFS: # of free 1K blocks can be used by 				 * "normal" users.  It may be this is something				 * we should compute when asked for instead of 				 * storing in the superblock.  I don't know how				 * often this information is needed.				 */	/*	 *      graffiti area	 */};/* from jfs_dtree.h *//* *      entry segment/slot * * an entry consists of type dependent head/only segment/slot and * additional segments/slots linked vi next field; * N.B. last/only segment of entry is terminated by next = -1; *//* *	directory page slot */typedef struct {	s8 next;		/* 1: */	s8 cnt;			/* 1: */	UniChar name[15];	/* 30: */} dtslot_t;			/* (32) */#define DTSLOTDATALEN	15/* *	 internal node entry head/only segment */typedef struct {	pxd_t xd;		/* 8: child extent descriptor */	s8 next;		/* 1: */	u8 namlen;		/* 1: */	UniChar name[11];	/* 22: 2-byte aligned */} idtentry_t;			/* (32) */